What is the difference between a graphic designer and an illustrator?
 

Both graphic designers and illustrators do design-type work.Graphic designers will work on design elements and structures, providing a visual message for a company in order to sell a product or service.
Illustrators, on the other hand, will typically do commercial work for companies like comic book houses, publishing houses and advertising agencies. They do a lot more drawing, designing of product packaging, working on book illustrations, creating company logos, and graphic novels.
Graphic design degrees require a concentration in product design, website design, and publication design. Illustration students have some graphic design training, but most of their coursework includes art history, drawing, and painting. The illustrator doesn't have the advanced knowledge of a graphic designer.
If you like to draw and illustrate concepts, illustration would be a good fit. If you prefer to code, make websites, and do detail-type work, then graphic design might suit you better.

Illustrators create illustrations, while a graphic designer's job is to combine text, illustrations, photography, typography and color to convey a message or concept visually.

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A graphic designer is a professional who assembles together images, typography, or motion graphics to create a piece of design.

An illustrator is one who writes, draws skillfully to give a visual representation that corresponds to the content of the idea.

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Depends which school you're specifically referring to. Generally speaking, illustration is a very specialized form of graphic design, that is mostly specialized in creating artwork for the purposes of communication. Graphic design itself is broader, while it may call for illustration or photography skills, it is more concerned with layout and overall context.